content: /* Copyright (C) 2016-2018 Alibaba Group Holding Limited
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  
  // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  import com.google.protobuf.DescriptorProtos.DescriptorProto;
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.FilterInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /**
   * Tests the exceptions thrown when parsing from a stream. The methods on the {@link Parser}
   * interface are specified to only throw {@link InvalidProtocolBufferException}. But we really want
   * to distinguish between invalid protos vs. actual I/O errors (like failures reading from a
   * socket, etc.). So, when we're not using the parser directly, an {@link IOException} should be
   * thrown where appropriate, instead of always an {@link InvalidProtocolBufferException}.
   *
   * @author jh@squareup.com (Joshua Humphries)
   */
  @RunWith(JUnit4.class)
  public class ParseExceptionsTest {
  
    private interface ParseTester {
      DescriptorProto parse(InputStream in) throws IOException;
    }
  
    private byte serializedProto[];
  
    private void setup() {
      serializedProto = DescriptorProto.getDescriptor().toProto().toByteArray();
    }
  
    private void setupDelimited() {
      ByteArrayOutputStream bos = new ByteArrayOutputStream();
      try {
        DescriptorProto.getDescriptor().toProto().writeDelimitedTo(bos);
      } catch (IOException e) {
        fail("Exception not expected: " + e);
      }
      serializedProto = bos.toByteArray();
    }
  
    @Test public void message_parseFrom_InputStream() {
      setup();
      verifyExceptions(
          new ParseTester() {
            @Override
            public DescriptorProto parse(InputStream in) throws IOException {
              return DescriptorProto.parseFrom(in);
            }
          });
    }
  
    @Test public void message_parseFrom_InputStreamAndExtensionRegistry() {
      setup();
      verifyExceptions(
          new ParseTester() {
            @Override
            public DescriptorProto parse(InputStream in) throws IOException {
              return DescriptorProto.parseFrom(in, ExtensionRegistry.newInstance());
            }
          });
    }
  
    @Test public void message_parseFrom_CodedInputStream() {
      setup();
      verifyExceptions(
          new ParseTester() {
            @Override
            public DescriptorProto parse(InputStream in) throws IOException {
              return DescriptorProto.parseFrom(CodedInputStream.newInstance(in));
            }
          });
    }
  
    @Test public void message_parseFrom_CodedInputStreamAndExtensionRegistry() {
      setup();
      verifyExceptions(
          new ParseTester() {
            @Override
            public DescriptorProto parse(InputStream in) throws IOException {
              return DescriptorProto.parseFrom(
                  CodedInputStream.newInstance(in), ExtensionRegistry.newInstance());
            }
          });
    }
  
    @Test public void message_parseDelimitedFrom_InputStream() {
      setupDelimited();
      verifyExceptions(
          new ParseTester() {
            @Override
            public DescriptorProto parse(InputStream in) throws IOException {
              return DescriptorProto.parseDelimitedFrom(in);
            }
          });
    }
  
    @Test public void message_parseDelimitedFrom_InputStreamAndExtensionRegistry() {
      setupDelimited();
      verifyExceptions(
          new ParseTester() {
            @Override
            public DescriptorProto parse(InputStream in) throws IOException {
              return DescriptorProto.parseDelimitedFrom(in, ExtensionRegistry.newInstance());
            }
          });
    }
  
    @Test public void messageBuilder_mergeFrom_InputStream() {
      setup();
      verifyExceptions(
          new ParseTester() {
            @Override
            public DescriptorProto parse(InputStream in) throws IOException {
              return DescriptorProto.newBuilder().mergeFrom(in).build();
            }
          });
    }
  
    @Test public void messageBuilder_mergeFrom_InputStreamAndExtensionRegistry() {
      setup();
      verifyExceptions(
          new ParseTester() {
            @Override
            public DescriptorProto parse(InputStream in) throws IOException {
              return DescriptorProto.newBuilder()
                  .mergeFrom(in, ExtensionRegistry.newInstance())
                  .build();
            }
          });
    }
  
    @Test public void messageBuilder_mergeFrom_CodedInputStream() {
      setup();
      verifyExceptions(
          new ParseTester() {
            @Override
            public DescriptorProto parse(InputStream in) throws IOException {
              return DescriptorProto.newBuilder().mergeFrom(CodedInputStream.newInstance(in)).build();
            }
          });
    }
  
    @Test public void messageBuilder_mergeFrom_CodedInputStreamAndExtensionRegistry() {
      setup();
      verifyExceptions(
          new ParseTester() {
            @Override
            public DescriptorProto parse(InputStream in) throws IOException {
              return DescriptorProto.newBuilder()
                  .mergeFrom(CodedInputStream.newInstance(in), ExtensionRegistry.newInstance())
                  .build();
            }
          });
    }
  
    @Test public void messageBuilder_mergeDelimitedFrom_InputStream() {
      setupDelimited();
      verifyExceptions(
          new ParseTester() {
            @Override
            public DescriptorProto parse(InputStream in) throws IOException {
              DescriptorProto.Builder builder = DescriptorProto.newBuilder();
              builder.mergeDelimitedFrom(in);
              return builder.build();
            }
          });
    }
  
    @Test public void messageBuilder_mergeDelimitedFrom_InputStreamAndExtensionRegistry() {
      setupDelimited();
      verifyExceptions(
          new ParseTester() {
            @Override
            public DescriptorProto parse(InputStream in) throws IOException {
              DescriptorProto.Builder builder = DescriptorProto.newBuilder();
              builder.mergeDelimitedFrom(in, ExtensionRegistry.newInstance());
              return builder.build();
            }
          });
    }
  
    private void verifyExceptions(ParseTester parseTester) {
      // No exception
      try {
        assertEquals(DescriptorProto.getDescriptor().toProto(),
            parseTester.parse(new ByteArrayInputStream(serializedProto)));
      } catch (IOException e) {
        fail("No exception expected: " + e);
      }
  
      // IOException
      try {
        // using a "broken" stream that will throw part-way through reading the message
        parseTester.parse(broken(new ByteArrayInputStream(serializedProto)));
        fail("IOException expected but not thrown");
      } catch (IOException e) {
        assertFalse(e instanceof InvalidProtocolBufferException);
      }
  
      // InvalidProtocolBufferException
      try {
        // make the serialized proto invalid
        for (int i = 0; i < 50; i++) {
          serializedProto[i] = -1;
        }
        parseTester.parse(new ByteArrayInputStream(serializedProto));
        fail("InvalidProtocolBufferException expected but not thrown");
      } catch (IOException e) {
        assertTrue(e instanceof InvalidProtocolBufferException);
      }
    }
  
    private InputStream broken(InputStream i) {
      return new FilterInputStream(i) {
        int count = 0;
  
        @Override public int read() throws IOException {
          if (count++ >= 50) {
            throw new IOException("I'm broken!");
          }
          return super.read();
        }
  
        @Override public int read(byte b[], int off, int len) throws IOException {
          if ((count += len) >= 50) {
            throw new IOException("I'm broken!");
          }
          return super.read(b, off, len);
        }
      };
    }
  }
  